{"id":10008386,"date":"2024-02-22T13:50:58","date_gmt":"2024-02-22T05:50:58","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008386"},"modified":"2024-02-22T13:50:58","modified_gmt":"2024-02-22T05:50:58","slug":"go-deadcode%ef%bc%9a%e6%9f%a5%e6%89%be%e6%b2%a1%e6%84%8f%e4%b9%89%e7%9a%84%e6%ad%bb%e4%bb%a3%e7%a0%81%ef%bc%8c%e5%af%b9%e4%ba%8e%e7%bb%b4%e6%8a%a4%e9%a1%b9%e7%9b%ae%e6%8c%ba%e6%9c%89%e7%94%a8%ef%bc%81","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008386","title":{"rendered":"Go deadcode\uff1a\u67e5\u627e\u6ca1\u610f\u4e49\u7684\u6b7b\u4ee3\u7801\uff0c\u5bf9\u4e8e\u7ef4\u62a4\u9879\u76ee\u633a\u6709\u7528\uff01"},"content":{"rendered":"

\u5927\u5bb6\u597d\uff0c\u6211\u662f\u714e\u9c7c\u3002<\/p>\n

\u8fd8\u8bb0\u5f97\u6211\u524d\u4e24\u5e74\u5728\u6df1\u5733\u53c2\u52a0\u4e86\u4e2a\u6280\u672f\u5927\u4f1a\uff0c\u5176\u4e2d\u4e00\u4e2a\u8bae\u9898\u662f\u643a\u7a0b\u7684\u4e00\u4e2a\u5927\u4f6c\u5206\u4eab\u4ed6\u5728\u65e5\u5e38\u5de5\u4f5c\u4e2d\uff0c\u53d1\u73b0\u4e00\u5927\u5806\u8fc7\u65f6\u7684\u65e0\u610f\u4e49\u4ee3\u7801\u548c\u903b\u8f91\uff0c\u5bfc\u81f4\u5927\u5bb6\u5de5\u4f5c\u8f83\u4e3a\u7e41\u7410\u4e14\u8f83\u4e3a\u8f9b\u82e6\u7684\u60c5\u51b5\u3002<\/p>\n

\u643a\u7a0b\u5e94\u8be5\u662f Java \u5e94\u7528\u4e3a\u4e3b\uff0c\u4ed6\u57fa\u4e8e Java \u5404\u79cd\u7814\u7a76\uff0c\u901a\u8fc7 JVM \u5185\u53c2\u6570\u7ed3\u5408\u5404\u79cd\u624b\u6bb5\u627e\u5230\u4e86\u65e0\u610f\u4e49\u7684\u6b7b\u4ee3\u7801\uff0c\u5e76\u901a\u8fc7\u7070\u5ea6\u673a\u5236\u7b49\u5b8c\u6210\u4e86\u9010\u6b65\u4e0a\u7ebf\u548c\u66ff\u6362\u3002<\/p>\n

\u6700\u8fd1 Go \u5b98\u65b9\u4e5f\u7ec8\u4e8e\u6709\u4e86\u7c7b\u4f3c\u7684\u5de5\u5177\uff0c\u4eca\u5929\u5206\u4eab\u7ed9\u5927\u5bb6\uff0c\u53ef\u4ee5\u6301\u7eed\u5173\u6ce8\uff01<\/p>\n

\u7528 deadcode \u68c0\u6d4b\u4ee3\u7801<\/h2>\n

\u666e\u904d\u6765\u8bb2\uff0c\u4f5c\u4e3a Go \u9879\u76ee\u6e90\u4ee3\u7801\u4e00\u90e8\u5206\uff0c\u4f46\u5728\u4efb\u4f55\u6267\u884c\u8fc7\u7a0b\u4e2d\u90fd\u65e0\u6cd5\u89e6\u53ca\u7684\u51fd\u6570\u88ab\u79f0\u4e3a “\u6b7b\u4ee3\u7801”\uff0c\u5b83\u4eec\u4f1a\u62d6\u7d2f\u4ee3\u7801\u5e93\u7684\u7ef4\u62a4\u5de5\u4f5c\u3002<\/p>\n

\u4e5f\u4f1a\u9020\u6210\u7a0b\u5e8f\u5458\u5728\u9605\u8bfb\u4ee3\u7801\u65f6\u7684\u8ba4\u77e5\u8d1f\u62c5\uff0c\u770b\u4e86\u534a\u5929\u53d1\u73b0\u8fd9\u4ee3\u7801\u6839\u672c\u6ca1\u7528\u3002\u6216\u662f\u83ab\u540d\u5176\u5999\u5c31\u88ab\u5f15\u5165\u6a21\u5757\u4f9d\u8d56\u91cc\u91cc\u3002\u5c34\u5c2c\u5f97\u5f88\u3002<\/p>\n

\u73b0\u5728\u6211\u4eec\u53ef\u4ee5\u7528 deadcode \u6765\u8bc6\u522b\u4ed6\u3002\u5b89\u88c5\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n

$ go install golang.org\/x\/tools\/cmd\/deadcode@latest\n$ deadcode -help\nThe deadcode command reports unreachable functions in Go programs.\n\nUsage: deadcode [flags] package...<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355 Demo\uff1a<\/p>\n
func main() {\n    var g Greeter\n    g = Helloer{}\n    g.Greet()\n}\n\ntype Greeter interface{ Greet() }\n\ntype Helloer struct{}\ntype Goodbyer struct{}\n\nvar _ Greeter = Helloer{}\nvar _ Greeter = Goodbyer{}\n\nfunc (Helloer) Greet()  { hello() }\nfunc (Goodbyer) Greet() { goodbye() }\n\nfunc hello()   { fmt.Println("\u4f60\u597d\uff0c\u714e\u9c7c\uff01") }\nfunc goodbye() { fmt.Println("\u518d\u89c1\uff0c\u714e\u9c7c\uff01") }<\/code><\/pre>\n
\u8fd0\u884c\u7ed3\u679c\uff1a<\/p>\n
$ go run main.go\n\u4f60\u597d\uff0c\u714e\u9c7c\uff01<\/code><\/pre>\n
\u548b\u4e00\u773c\u4e00\u770b\uff0c\u53ef\u80fd\u6ca1\u6cd5\u77e5\u9053\u662f\u54ea\u5757\u4ee3\u7801\u6ca1\u7528\u5230\u3002\u8fd8\u9700\u8981\u591a\u770b\u4e24\u773c\u3002<\/p>\n
\u8fd9\u65f6\u5019\u6211\u4eec\u53ea\u9700\u8981\u501f\u52a9 deadcode \u5de5\u5177\u53bb\u626b\u63cf\uff0c\u4e00\u4e0b\u5b50\u5c31\u80fd\u5f97\u5230\u7ed3\u679c\u4e86\u3002<\/p>\n
\u6267\u884c\u5982\u4e0b\u547d\u4ee4\u5e76\u67e5\u770b\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
$ deadcode .\nmain.go:20:17: unreachable func: Goodbyer.Greet\nmain.go:23:6: unreachable func: goodbye<\/code><\/pre>\n
\u68c0\u6d4b\u7ed3\u679c\u544a\u8bc9\u6211\u4eec goodbye \u51fd\u6570\u548c Goodbyer.Greet \u65b9\u6cd5\u90fd\u65e0\u6cd5\u8bbf\u95ee\u3002\u4e5f\u5c31\u662f\u8fd9\u4e2a\u4ee3\u7801\u672c\u8eab\u7684\u5b58\u5728\u662f\u6ca1\u6709\u8fd0\u884c\u610f\u4e49\u7684\u3002<\/p>\n
\u5982\u679c\u4f60\u5e0c\u671b\u6e05\u9664\u8fd9\u4e9b\u9a9a\u6270\u4ee3\u7801\uff0c\u5c31\u53ef\u4ee5\u4f9d\u636e\u8fd9\u4e2a\u7ed3\u679c\u53bb\u505a\u5220\u9664\u4ee3\u7801\u4e86\u3002<\/p>\n
\u540c\u65f6\u4e5f\u53ef\u4ee5\u501f\u52a9\u547d\u4ee4\u7684\u5b50\u9009\u9879 -whylive<\/code>\uff0c\u8ba9\u68c0\u6d4b\u5de5\u5177\u7ed9\u6211\u4eec\u89e3\u91ca\u4e3a\u4ec0\u4e48 greet.hello<\/code> \u51fd\u6570\u662f\u6709\u6548\u7684\u3002<\/p>\n
\u5982\u4e0b\u89e3\u91ca\u7ed3\u679c\uff1a<\/p>\n
$ deadcode -whylive=example.com\/greet.hello .\n                  example.com\/greet.main\ndynamic@L0008 --> example.com\/greet.Helloer.Greet\n static@L0019 --> example.com\/greet.hello\n                   example.com\/greet.main\n  ...<\/code><\/pre>\n
\u8be5\u547d\u4ee4\u4f1a\u628a main \u5f00\u59cb\u5230\u51fd\u6570\u8c03\u7528\u7684\u8fc7\u7a0b\u6253\u5370\u51fa\u6765\uff0c\u4f5c\u4e3a\u4e00\u79cd\u89e3\u91ca\u3002\u8bc1\u660e\u8fd9\u4e2a\u51fd\u6570\u786e\u5b9e\u662f\u5b58\u5728\u4f7f\u7528\u7684\u3002<\/p>\n
\u6ce8\u610f\u70b9\u548c\u53d1\u73b0\u673a\u5236<\/h2>\n
\u9700\u8981\u7559\u610f\u7684\u662f\uff1adeadcode \u5de5\u5177\uff0c\u5fc5\u987b\u8981\u5305\u542b main \u51fd\u6570\u3002\u8a00\u5916\u4e4b\u610f\u5c31\u662f\u5176\u68c0\u6d4b\u94fe\u8def\u662f\u4ece main \u51fd\u6570\u5f00\u59cb\u7684\u3002<\/p>\n
\u5426\u5219\u4f1a\u4ea7\u751f\u5982\u4e0b\u7684\u62a5\u9519\u4fe1\u606f\uff1a<\/p>\n
$ deadcode .\ndeadcode: no main packages<\/code><\/pre>\n
deadcode \u5de5\u5177\u672c\u8eab\u4f1a\u52a0\u8f7d\u3001\u89e3\u6790\u548c\u7c7b\u578b\u68c0\u67e5\u6307\u5b9a\u7684\u5305\uff0c\u7136\u540e\u5c06\u5176\u8f6c\u6362\u4e3a\u7c7b\u4f3c\u7f16\u8bd1\u5668\u7684\u4e2d\u95f4\u8868\u793a\u5f62\u5f0f\u3002<\/p>\n
\u7136\u540e\u4f1a\u4f7f\u7528 Rapid Type Analysis\uff08RTA\uff09\u7684\u7b97\u6cd5\u6765\u5efa\u7acb\u53ef\u8fbe\u51fd\u6570\u96c6\uff0c\u6700\u521d\u53ea\u5305\u62ec\u6bcf\u4e2a\u4e3b\u8981\u5305\u7684\u5165\u53e3\u70b9\uff1amain \u51fd\u6570\u548c\u5305\u521d\u59cb\u5316\u51fd\u6570\uff08\u5206\u914d\u5168\u5c40\u53d8\u91cf\u5e76\u8c03\u7528\u540d\u4e3a init \u7684\u51fd\u6570\uff09\u3002<\/p>\n
RTA \u5206\u6790\u6bcf\u4e2a\u53ef\u8fbe\u51fd\u6570\u7684\u8bed\u53e5\u4f53\u4ee5\u6536\u96c6\u4e09\u79cd\u7c7b\u578b\u7684\u4fe1\u606f\uff1a\u76f4\u63a5\u8c03\u7528\u7684\u51fd\u6570\u96c6\u5408\u3001\u901a\u8fc7\u63a5\u53e3\u65b9\u6cd5\u8fdb\u884c\u7684\u52a8\u6001\u8c03\u7528\u96c6\u5408\u4ee5\u53ca\u8f6c\u6362\u4e3a\u63a5\u53e3\u7684\u7c7b\u578b\u96c6\u5408\u3002<\/p>\n
\u56e0\u6b64\u4ed6\u5fc5\u987b\u4f9d\u8d56 main \u51fd\u6570\u4f5c\u4e3a\u4e3b\u5165\u53e3\u6765\u505a\u8c03\u7528\u94fe\u8def\u5206\u6790\u3002\u5f53\u7136\u4e86\uff0c\u8fd9\u4e5f\u662f\u76f8\u5bf9\u6b63\u5e38\u7684\u3002\u603b\u5f97\u6709\u4e2a \u201c\u5ba2\u6237\u7aef\u201d \u6765\u505a\u5f00\u59cb\u903b\u8f91\u3002<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u5b9a\u671f\u5728 Go \u9879\u76ee\u4e0a\u8fd0\u884c deadcode \u547d\u4ee4\uff08\u7279\u522b\u662f\u5728\u91cd\u6784\u5de5\u4f5c\u4e4b\u540e\uff09\uff0c\u4ee5\u5e2e\u52a9\u8bc6\u522b\u7a0b\u5e8f\u4e2d\u4e0d\u518d\u9700\u8981\u7684\u90e8\u5206\u3002<\/p>\n
\u4f46\u9700\u8981\u7559\u610f\u7684\u662f\uff0cdeadcode \u5de5\u5177\u8fd8\u662f\u5728\u53d1\u5c55\u9636\u6bb5\u3002\u590d\u6742\u573a\u666f\u4e0b\uff0c\u53ef\u80fd\u65e0\u6cd5\u4fdd\u8bc1 100% \u7684\u51c6\u786e\u7387\uff0c\u6211\u4eec\u6700\u597d\u8fd8\u662f\u8981\u81ea\u5df1\u505a\u4e00\u904d double check \u548c\u7070\u5ea6\u4e0a\u7ebf\u3002<\/p>\n
\u603b\u7ed3<\/h2>\n
\u4eca\u5929\u57fa\u4e8e\u5b98\u65b9\u7684\u300aFinding unreachable functions with deadcode\u300b\u7ed9\u5927\u5bb6\u5206\u4eab\u4e86 deadcode \u5de5\u5177\u7684\u4f7f\u7528\u548c\u673a\u5236\u3002<\/p>\n
\u6574\u4f53\u4e0a\u6765\u8bb2\uff0c\u8fd8\u662f\u975e\u5e38\u4e50\u89c1\u8fd9\u4e2a\u5de5\u5177\u7684\u8bde\u751f\u548c\u53d1\u5c55\u7684\u3002\u5386\u53f2\u9879\u76ee\u7ef4\u62a4\u65e7\u4e86\uff0c\u5f88\u591a\u5730\u65b9\u5220\u5220\u6539\u6539\uff0c\u5806\u79ef\u4e45\u4e86\u540e\uff0c\u786e\u5b9e\u4f1a\u7ed9\u5927\u5bb6\u5f00\u53d1\u9020\u6210\u4e0d\u5c11\u7684\u8ba4\u77e5\u8d1f\u62c5\u548c\u7ef4\u62a4\u6210\u672c\u3002<\/p>\n
\u6587\u7ae0\u6301\u7eed\u66f4\u65b0\uff0c\u53ef\u4ee5\u5fae\u4fe1\u641c\u3010\u8111\u5b50\u8fdb\u714e\u9c7c\u4e86\u3011\u9605\u8bfb\uff0c\u672c\u6587 GitHub<\/strong> github.com\/eddycjy\/blog<\/a> \u5df2\u6536\u5f55\uff0c\u5b66\u4e60 Go \u8bed\u8a00\u53ef\u4ee5\u770b Go \u5b66\u4e60\u5730\u56fe\u548c\u8def\u7ebf<\/a>\uff0c\u6b22\u8fce Star \u50ac\u66f4\u3002<\/p><\/blockquote>\n
\u63a8\u8350\u9605\u8bfb<\/h4>\n